Connections
5.12 The system is designed to be connected to
copper tube to BS EN 1057 : 1996, using
conventional plumbing fittings (see Table 1 for
details of connection sizes and threads). The
connections are of adequate size.
6 Safety
Excessive temperature — Prevention of explosion
— Safe discharge of hot water
6.1 The safety devices provided to ensure
that the temperature of the stored water will
not exceed 100°C, and safeguard the
operation of the system, are:
For the indirect coil heat exchanger
• the combined temperature and pressure relief
valve, and
• the indirect non-self-resetting thermal cut-out fitted
to the system and wired into the motorised
valve
(1)
.
For the direct immersion heater
• the combined temperature and pressure relief
valve, and
• the direct non-self-resetting thermal cut-out fitted
to the system and wired into the immersion
heater.
(1) The motorised valve must be fitted to the primary flow and
appropriate electrical connections made (see sections 6.9
and 16).
6.2 The system has a safety warning label
attached to the storage cylinder, bearing an
explanation of the action to be taken in the case
of any malfunction of the system. It is essential that
the instructions are followed.
6.3 The system has adequate provision for safe
disposal of discharges from the expansion valve
and the combined temperature and pressure relief
valve [see also sections 16(2) and (3)].
Physical contact
6.4 The surfaces of the storage cylinder are
protected by the insulation. In normal use the
temperatures of the surfaces of the various parts of
the system are comparable with those in a
conventional, vented, hot water storage system.
Strength and stability
6.5 The system has adequate resistance to internal
pressures and does not visibly deform when
subjected to a vacuum of 0.1 bar absolute.
6.6 The system’s pressure control devices will
ensure that the operating pressure will be controlled
to a nominal 3 bar and that the design pressure of
5 bar is not exceeded. Each storage cylinder has
been satisfactorily pressure tested to 1.5 times the
design pressure, ie 7.5 bar.
6.7 The weight of the system is stated on the
label attached (see also Table 1); the support
arrangements appropriate to a conventional
system apply.
6.8 Care must be taken to avoid damage to the
system during handling and installation.
Electrical safety
6.9 The indirect thermostat, non-self-resetting
thermal cut-out and motorised valve, and the
direct thermostat and non-self-resetting thermal
cut-out are approved by the BEAB to BS 3955 :
1986. The immersion heater is approved by the
BEAB to BS EN 60335-2.73 : 2003. To ensure
safety it is essential that the electrical wiring is
carried out in accordance with the
IEE Wiring
Regulations — Regulations for Electrical
Installations, Sixteenth Edition 1991
.
7 Properties in relation to fire
7.1 The expanded polyurethane foam insulant is
covered with a steel outer casing and only a small
area of the insulation will be exposed at
connection bosses. In the presence of a source of
ignition, such as a plumber’s blowlamp, the foam
will flame locally and emit toxic fumes. Flaming
and fume emission will stop when the source of
ignition is removed.
7.2 In service, the steel outer casing encloses
the foam and risk of ignition will be minimal.
During installation care should be exercised when
using a blowlamp to make soldered joints on
pipework
adjacent to the cylinder. Installation
does not require
soldered joints to be made direct
to the system.
8 Effect on water quality and prevention of
waste of water
The system is listed by the UKWFBS.
9 Watertightness
The storage cylinder remains watertight at
pressures
in excess of 1.5 times the design pressure,
ie 7.5 bar.
10 Noise
The system is quiet in normal operation, the flow
of water being via conventional water pipe fittings,
and compares favourably with a vented, hot water
storage system.
11 Physiological effects
The insulation is a conventional material. It will not
encourage vermin or bacteria and is not
susceptible to damage from moisture.
12 Maintenance
12.1 It is recommended that, annually, a
competent person:
• inspects and cleans the line strainer, and
• measures the pressure in the expansion vessel
and recharges as necessary.
5
To Next Page
Loading...
